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Add my contribution or filesfeat: add Sudoku solver using recursive backtracking algorithm - #1275
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Hacktoberfest Contribution: 9x9 Sudoku Solver
Contributed by: @suravisehgal
Overview & Changes:
New File: Added sudoku_solver.py implementing a standalone 9x9 Sudoku solver via recursive backtracking.
Interactive CLI:
Features 3 modes: solving a benchmark puzzle, automated self-tests, and custom 9x9 user inputs.
ASCII Visualization:
Clean terminal grid display with clear 3x3 subgrid boundaries.
Why Add This?:
Fills a gap in the repository by adding an educational example of backtracking and state validation.
Verification & Quality:
Tested: Runs cleanly (python3 sudoku_solver.py) with zero errors, all self-tests pass.
Clean Code: 100% PEP 8 compliant with type annotations, beginner-friendly comments, and zero external dependencies (pure Python).
No Duplicates: Verified no similar Sudoku solver exists in the codebase.
CC @souravjain540 — Thanks for reviewing! 🙌